دورية أكاديمية
Effect of the Sulfonation on the Swollen State Morphology of Styrenic Cross-Linked Polymers
| العنوان: | Effect of the Sulfonation on the Swollen State Morphology of Styrenic Cross-Linked Polymers |
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| المؤلفون: | Chiara Dalla Valle, Marco Zecca, Federico Rastrelli, Cristina Tubaro, Paolo Centomo |
| المصدر: | Polymers, Vol 12, Iss 3, p 600 (2020) |
| بيانات النشر: | MDPI AG, 2020. |
| سنة النشر: | 2020 |
| المجموعة: | LCC:Organic chemistry |
| مصطلحات موضوعية: | swollen state porosity, crosslinked polymers, sulfone bridges, isec, cp-mas 13c-nmr, Organic chemistry, QD241-441 |
| الوصف: | The chemical structure and morphology of a set of sulfonic gel-type poly(styrene-divinylbenzene) resins (2 mol% DVB) prepared with different synthetic approaches were investigated by solid state NMR, Inverse Size Exclusion Chromatography (ISEC), FT-IR and elemental analysis to compare their swollen state structure. FT-IR and solid state NMR clearly show that the sulfonation mainly occurs in the para- position with respect the main polymer chain. Sensible proportions of sulfone bridges were found in the materials obtained with oleum and chlorosulfonic acid. With oleum, the presence of the sulfone bridges is clearly associated to a reduced ability to swell in the water medium relative to the proton exchange capacity. This highlights the cross-linking action of the sulfone bridges according to ISEC results, showing a high proportion of a dense polymer fraction in the swollen material. An even higher degree of sulfone-bridging, lower swelling ability, and a high proportion of a dense polymer fraction in the swollen material are found in the resin obtained with chlorosulfonic acid. As a matter of fact, Cross Polarization Magic Angle Spinning Nuclear Magnetic Resonance (CP-MAS 13C-NMR), elemental analysis, and ion exchange capacity, show that oleum and chlorosulfonic acid produced resins with remarkably smaller pores and lower swollen gel volume in polar solvents, with respect to concentrated sulfuric acid. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2073-4360 12030600 |
| العلاقة: | https://www.mdpi.com/2073-4360/12/3/600Test; https://doaj.org/toc/2073-4360Test |
| DOI: | 10.3390/polym12030600 |
| الوصول الحر: | https://doaj.org/article/269326ed753343e180192b843ba1d2bfTest |
| رقم الانضمام: | edsdoj.269326ed753343e180192b843ba1d2bf |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20734360 12030600 |
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| DOI: | 10.3390/polym12030600 |